<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	<style type="text/css">
		*{
			margin:0;
			padding:0;
		}
		.box1{background: red;
			height:100px;
			width:200px;
			float:left;
			position: absolute;
			left:150px;
			top:200px;
		    z-index: 1;
			
		}
		.box2{background: green;
			height:100px;
			width:100px;
			float:left;
			position: absolute;
			left:200px;
			top:200px;
		/*	opacity: 0.5;*/
		}
		.box3{background: red;
			height:100px;
			width:100px;
			float:left;
			
		}
		.boss{
			position:relative;
			width:500px;
			height:500px;
			background:orange;
			z-index:3;
		}
	</style>
	</head>
	<body>
		<div class="boss">
		<div class="box1"></div>
		<div class="box2"></div>
		<div class="box3"></div>
		</div>
	</body>
</html>
